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Limits to Natural Selection

Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.For one, natural selection can only act upon existing genetic variation. Hypothetically, redtusks may enhance elephant survival by deterring ivory-seeking poachers. However, if there are no gene variants—or alleles—for redtusks, natural selection cannot increase the prevalence of...
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Conservation of Declining Populations

Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
Criticisms of the Evolutionary Perspective01:23

Criticisms of the Evolutionary Perspective

In a study where individuals posing as strangers offered compliments and proposed casual sex to students, the responses differed significantly based on gender. Not a single woman accepted the proposal, while 70% of the men agreed. This outcome provides a useful scenario to explore through the lens of evolutionary psychology and social learning theory, highlighting the diverse perspectives on human sexual behaviors.
Evolutionary psychology provides one explanation for these findings, suggesting...
Avoidance Learning and Learned Helplessness01:14

Avoidance Learning and Learned Helplessness

Avoidance learning and learned helplessness are critical concepts in understanding behavioral responses to negative stimuli.
Avoidance learning occurs when an organism learns that a specific behavior can prevent an unpleasant outcome. For example, a student who receives a bad grade may start studying harder to avoid future poor grades. This behavior persists even when the negative outcome is no longer present. Avoidance learning is powerful because it maintains behavior in the absence of the...
Instinctive Drift01:05

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Instinctive drift refers to the tendency of animals to revert to their innate behaviors despite repeated reinforcement. Breland and Breland demonstrated this concept in an experiment with a raccoon. The raccoon was trained to pick up two coins and place them in a container in exchange for food. Initially, the raccoon learned to associate the coins with food, making them a conditioned stimulus or a substitute for food. However, over time, the raccoon became less willing to put the coins into the...
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Instinct Theory

Instinct theory proposes that innate biological instincts, like animal behavioral patterns, primarily drive human behavior. These instincts are inborn, not learned, and are fundamental to decision-making and action. Just as animals rely on instincts for critical survival functions such as migration, nest building, and defense, humans are also believed to exhibit behaviors rooted in evolutionary needs. For example, the instinct to reproduce motivates sexual behavior, while territorial instincts...

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Video Experimental Relacionado

Updated: Jul 5, 2026

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
10:20

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter

Published on: March 12, 2013

Teoría del refugio y control biológico.

B A Hawkins, M B Thomas, M E Hochberg

    Science (New York, N.Y.)
    |November 26, 1993
    PubMed
    Resumen

    Los refugios de insectos impactan en las comunidades de parásitos y en el éxito del control biológico. Menos refugio significa un control de plagas más efectivo, revelando reglas ecológicas generales para las poblaciones y comunidades.

    Área de la Ciencia:

    • Ecología Ecología Ecología.
    • Dinámica de las poblaciones.
    • El control biológico es el control biológico.

    Sus antecedentes:

    • Las comunidades ecológicas a menudo se rigen por reglas generales.
    • Los refugios anfitriones de los insectos parasitoides influyen en la riqueza de la comunidad parasitoide.
    • La teoría del refugio explica los patrones en la dinámica de la población y la estructura de la comunidad.

    Objetivo del estudio:

    • Extender la teoría del refugio a las aplicaciones de control biológico.
    • Investigar la relación entre los refugios de insectos y la eficacia del control biológico.
    • Demostrar los refugios como un mecanismo general para los patrones ecológicos.

    Principales métodos:

    • Modelado teórico de las interacciones huésped-parasitoide.

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  • Análisis de los datos ecológicos existentes sobre la riqueza de la comunidad.
  • Validación empírica de la teoría del refugio en contextos de control biológico.

    • Principales resultados:

    • Los patrones de riqueza de las comunidades de parásitos son predichos por los refugios de los anfitriones.
    • El éxito del control biológico está inversamente relacionado con la proporción de insectos protegidos.
    • El tamaño del refugio tiene un impacto directo en la efectividad del control de plagas.

    Conclusiones:

    • La teoría del refugio proporciona un mecanismo unificador para los patrones ecológicos.
    • La comprensión de los refugios es fundamental para el éxito de las estrategias de control biológico.
    • Las reglas ecológicas generales rigen tanto las comunidades naturales como los sistemas gestionados.